CABT Certified Associate in Biomedical Technology Exam — Questions and Answers

Question 1: A biomedical technician is servicing a defibrillator and notices the time it takes to deliver a shock is significantly delayed. This issue is most likely related to a failing component responsible for storing electrical charge. Which of the following electronic components is the most probable cause?

Resistor
Diode
Transistor
Capacitor (Correct answer)

Correct answer: Capacitor

Capacitors are fundamental electronic components that store electrical energy in an electric field. In a defibrillator, a large capacitor is charged to a high voltage and then rapidly discharged to deliver the therapeutic shock. A failing capacitor would struggle to store the necessary charge or discharge it effectively, leading to performance issues like a delayed shock.

Question 2: Which approach is MOST important for CABT professionals when applying technical procedures?

Applying the same technique in every situation without variation
Using the fastest method available regardless of standards
Following personal shortcuts developed through experience
Adhering to established protocols while adapting to specific conditions (Correct answer)

Correct answer: Adhering to established protocols while adapting to specific conditions

Technical procedures require adherence to established protocols as a foundation, with professional judgment to adapt appropriately to specific conditions. This balance ensures both consistency and effectiveness.

Question 3: An op-amp in an inverting configuration has Rf = 100 kΩ and Rin = 10 kΩ. What is the voltage gain?

+0.1
+10
-0.1
-10 (Correct answer)

Correct answer: -10

Inverting amplifier gain = -Rf/Rin = -100kΩ/10kΩ = -10, where the negative sign indicates phase inversion.

Question 4: When comparing biphasic and monophasic defibrillators, which of the following is a key operational advantage of biphasic technology?

Biphasic waveforms are less effective but have a longer battery life.
Biphasic defibrillators always deliver a higher maximum energy shock (e.g., 360 Joules).
They require significantly less energy to achieve the same or higher efficacy, reducing potential cardiac damage. (Correct answer)
Monophasic technology is newer and provides more detailed post-shock ECG analysis.

Correct answer: They require significantly less energy to achieve the same or higher efficacy, reducing potential cardiac damage.

Biphasic defibrillators send the current in two directions, which allows them to terminate arrhythmias with significantly lower energy levels (e.g., 120-200J) compared to monophasic devices (which may go up to 360J). This lower energy reduces the risk of skin burns and damage to the heart muscle. Biphasic technology is the current standard and has largely replaced the older monophasic technology.

Question 5: A full oxygen E cylinder reads 2,000 psig. Using a cylinder factor of 0.28 L/psi and a flow of 5 L/min, about how long will it last?

280 minutes
400 minutes
112 minutes (Correct answer)
56 minutes

Correct answer: 112 minutes

2,000 × 0.28 = 560 L, and 560 ÷ 5 = 112 minutes.

Question 6: Which standard covers requirements for medical device software lifecycle processes?

ISO 14971
IEC 62304 (Correct answer)
IEC 60601-1
ISO 9001

Correct answer: IEC 62304

IEC 62304 specifies life cycle requirements for medical device software development, maintenance, and risk management processes.

Question 7: A Class I recall is initiated when a device has a reasonable probability of causing:

Only property damage with no human health risk
No health consequences but violates FDA labeling regulations
Minor adverse health consequences
Serious adverse health consequences or death (Correct answer)

Correct answer: Serious adverse health consequences or death

A Class I recall indicates the most serious situation where use of or exposure to the device will cause serious adverse health consequences or death.

Question 8: Under the FDA's Quality System Regulation (21 CFR Part 820), which record documents the complete history of the manufacture of a finished device lot?

Design History File (DHF)
Device Master Record (DMR)
Device History Record (DHR) (Correct answer)
Corrective Action Report (CAR)

Correct answer: Device History Record (DHR)

The Device History Record (DHR) contains the production records demonstrating that the device was manufactured in accordance with the DMR.

Question 9: An air-oxygen blender sounds an audible alarm during use. What is the most likely cause?

Flow set below 2 L/min
FiO2 set above 60%
Humidifier water too low
A significant pressure imbalance between the air and oxygen inlet supplies (Correct answer)

Correct answer: A significant pressure imbalance between the air and oxygen inlet supplies

Blenders alarm when inlet pressures differ substantially (about 20 psi), which compromises mixing accuracy.

Question 10: A Wheatstone bridge is balanced when:

R1 + R2 = R3 + R4
R1 - R2 = R3 - R4
R1/R2 = R3/R4 (Correct answer)
R1 × R2 = R3 × R4

Correct answer: R1/R2 = R3/R4

The Wheatstone bridge is balanced (zero galvanometer current) when the ratio of resistances in each arm are equal: R1/R2 = R3/R4.

Question 11: Which of the following is the most significant danger associated with microshock?

Induction of ventricular fibrillation from a very low current. (Correct answer)
Severe skin burns at the point of contact.
Overheating of internal electronic components.
Involuntary muscle contraction causing patient injury.

Correct answer: Induction of ventricular fibrillation from a very low current.

Microshock is hazardous because it involves a very small current applied directly to or near the heart, bypassing the skin's high resistance. Currents as low as 10 to 20 microamperes can be sufficient to induce ventricular fibrillation, a life-threatening cardiac arrhythmia. Macroshock, in contrast, involves larger currents passing through the skin.

Question 12: During an electrical safety inspection, a technician tests a portable patient monitor. Under NFPA 99 guidelines for equipment used in the patient care vicinity, the chassis leakage current must NOT exceed:

100 microamperes
500 microamperes
300 microamperes (Correct answer)
10 milliamperes

Correct answer: 300 microamperes

NFPA 99 sets specific limits for leakage current to ensure patient safety. For portable cord-connected appliances used within the "Patient Care Vicinity," the chassis leakage current must not exceed 300 microamperes (µA). This limit helps prevent microshock and macroshock hazards.

Question 13: Which physiological effect occurs when 60 Hz AC current in the range of 10–20 mA passes through the thorax?

Ventricular fibrillation
Tingling sensation only
'Let-go' threshold exceeded, causing inability to release the conductor (Correct answer)
Respiratory arrest without cardiac involvement

Correct answer: 'Let-go' threshold exceeded, causing inability to release the conductor

At 10–20 mA, sustained muscle tetany prevents voluntary release of the energized conductor, defining the 'let-go' threshold.

Question 14: An infusion pump alarms 'upstream occlusion.' What is the most likely cause?

Kinked IV tubing above the pump (Correct answer)
Air in the IV line
Incorrect drug concentration entered
Depleted battery

Correct answer: Kinked IV tubing above the pump

An upstream occlusion alarm typically indicates a blockage or kink in the tubing between the fluid bag and the pump, preventing fluid from reaching the pump.

Question 15: When performing electrical safety testing on patient care equipment, the ground wire resistance should typically not exceed:

0.5 ohms (Correct answer)
5.0 ohms
1.0 ohm
10.0 ohms

Correct answer: 0.5 ohms

NFPA 99 and AAMI standards generally require that the resistance of the equipment ground (protective earth) conductor not exceed 0.5 ohms.

Question 16: When a CABT professional encounters an unexpected result during a technical procedure, the FIRST action should be to:

Report the issue without any preliminary assessment
Repeat the procedure from the beginning immediately
Continue the procedure and address it later
Stop, assess the situation, and determine whether to proceed or seek guidance (Correct answer)

Correct answer: Stop, assess the situation, and determine whether to proceed or seek guidance

Stopping to assess the situation when unexpected results occur is critical. This allows the professional to evaluate whether it is safe and appropriate to continue, and to determine if additional guidance or resources are needed.

Question 17: What is the fundamental principle behind imaging systems in the CABT domain?

Cost minimization at all costs
Balancing performance, reliability, and efficiency (Correct answer)
Using the newest technology exclusively
Following a single vendor solution

Correct answer: Balancing performance, reliability, and efficiency

Effective technical design requires balancing performance requirements with reliability needs and operational efficiency.

Question 18: Which class of electrical equipment relies solely on basic insulation for protection and has no grounding conductor?

Class II
Class 0 (Correct answer)
Class I
Class III

Correct answer: Class 0

Class 0 equipment relies only on basic insulation with no additional safety measure such as grounding or protective extra-low voltage.

Question 19: Which approach best demonstrates mastery of laboratory equipment in CABT practice?

Applying principles to novel situations with sound judgment (Correct answer)
Following procedures without understanding
Relying entirely on technology
Avoiding complex scenarios

Correct answer: Applying principles to novel situations with sound judgment

True mastery involves understanding underlying principles well enough to apply them to new and unfamiliar situations with professional judgment.

Question 20: Which type of muscle tissue is involuntary, striated, and found only in the heart?

Smooth muscle
Visceral muscle
Skeletal muscle
Cardiac muscle (Correct answer)

Correct answer: Cardiac muscle

Cardiac muscle is uniquely involuntary and striated, with intercalated discs that allow electrical coupling between cells for coordinated contraction.

Question 21: What is HL7 primarily used for in healthcare?

Controlling electrical leakage current
Sterilizing instruments
Calibrating infusion pumps
Exchanging clinical and administrative data between healthcare information systems (Correct answer)

Correct answer: Exchanging clinical and administrative data between healthcare information systems

HL7 (Health Level Seven) is a set of messaging standards for exchanging patient, order, result, and administrative data between systems such as the EHR, lab, and monitoring systems.

Question 22: Which of the following best describes the purpose of a 'load test' on an uninterruptible power supply (UPS)?

Confirms the UPS can deliver rated output power for a specified duration (Correct answer)
Verifies input voltage regulation under steady-state conditions
Tests the surge suppression circuitry
Checks the battery charger input current

Correct answer: Confirms the UPS can deliver rated output power for a specified duration

A load test applies rated or specified load to the UPS to verify it sustains output power for the required backup duration.

Question 23: Which connective tissue structure connects muscle to bone?

Fascia
Ligament
Tendon (Correct answer)
Cartilage

Correct answer: Tendon

Tendons are dense regular connective tissue structures that attach skeletal muscles to bones, transmitting contractile force.

Question 24: The purpose of an isolation transformer in a line isolation monitor (LIM) system is to:

Provide backup power during an outage
Filter harmonics from medical imaging equipment
Isolate the power circuit from earth ground to reduce shock hazard (Correct answer)
Step down voltage to 12 V for patient circuits

Correct answer: Isolate the power circuit from earth ground to reduce shock hazard

An isolation transformer breaks the direct connection to earth ground, so a single fault does not complete a shock circuit through a grounded patient.

Question 25: Which of the following correctly describes the primary physiological function of the alveoli in the respiratory system?

To facilitate the exchange of oxygen and carbon dioxide between the air and the blood (Correct answer)
To produce mucus that traps foreign particles
To warm and humidify incoming air before it reaches the lungs
To contract and expand, forcing air in and out of the lungs

Correct answer: To facilitate the exchange of oxygen and carbon dioxide between the air and the blood

The alveoli are tiny, thin-walled air sacs in the lungs where the crucial process of gas exchange occurs. Oxygen from inhaled air diffuses across the alveolar and capillary walls into the bloodstream, while carbon dioxide diffuses from the blood into the alveoli to be exhaled.

Question 26: A biomedical technician is troubleshooting a complex medical imaging system and suspects the power supply module is faulty. The technician swaps the module with a known-good one from an identical system, and the fault is resolved. This troubleshooting technique is best described as:

Software diagnostics
Signal tracing
Component-level repair
Module substitution (Correct answer)

Correct answer: Module substitution

Module substitution is a troubleshooting method where a suspected faulty sub-assembly or module is replaced with a known functional one. If this action corrects the problem, it effectively isolates the fault to the original module, often leading to a faster repair.

Question 27: What is the main function of a dialysis machine?

Deliver anesthesia
Filter blood (Correct answer)
Monitor brain activity
Inject insulin

Correct answer: Filter blood

The main function of a dialysis machine is to filter and purify the blood when a patient's kidneys are no longer able to perform this vital function adequately. It removes waste products, excess salts, and water from the blood, mimicking the natural role of healthy kidneys. This process is crucial for patients with kidney failure to maintain fluid and electrolyte balance.

Question 28: What is a common troubleshooting step for devices with erratic readings?

Restart software
Update manual
Turn it off
Check sensors and calibration (Correct answer)

Correct answer: Check sensors and calibration

When a medical device provides erratic readings, a common and crucial troubleshooting step is to check its sensors and calibration. Sensors are responsible for accurate data acquisition, and if they are dirty, damaged, or misaligned, readings will be unreliable. Recalibrating the device ensures that it measures parameters accurately against known standards, restoring its precision and trustworthiness.

Question 29: What is the purpose of a pulse oximeter?

Measure temperature
Check glucose
Check blood oxygen level (Correct answer)
Analyze enzymes

Correct answer: Check blood oxygen level

A pulse oximeter is a non-invasive medical device used to measure a patient's oxygen saturation level in the blood (SpO2) and their pulse rate. It works by emitting light through a finger or earlobe and detecting the amount of light absorbed by oxygenated and deoxygenated hemoglobin. This quick and easy measurement provides crucial information about a patient's respiratory and circulatory status.

Question 30: A biomedical technician is calibrating an intraocular pressure monitor. Which fluid is measured indirectly by this device?

Cerebrospinal fluid
Vitreous humor
Perilymph
Aqueous humor (Correct answer)

Correct answer: Aqueous humor

Intraocular pressure is largely determined by the production and drainage of aqueous humor in the anterior segment of the eye.

Question 31: A CBET is asked to evaluate a newly proposed telemedicine cart that includes a tablet, camera, and vital signs monitor. The MOST appropriate regulatory framework to apply is:

HIPAA Security Rule only, since only data is transmitted
Only state telemedicine licensure laws
FCC regulations for wireless transmission exclusively
FDA regulations for the vital signs monitor component plus HIPAA for data security (Correct answer)

Correct answer: FDA regulations for the vital signs monitor component plus HIPAA for data security

The vital signs monitor is an FDA-regulated medical device, while HIPAA governs the security of any transmitted patient health information, making both frameworks applicable.

Question 32: A hemodialysis machine's conductivity alarm activates during treatment. What is the immediate corrective action?

Increase blood flow rate
Increase ultrafiltration rate
Take the patient off bypass and return blood (Correct answer)
Recalibrate the conductivity probe

Correct answer: Take the patient off bypass and return blood

A conductivity alarm indicates an unsafe dialysate concentration; the patient should immediately be taken off bypass and blood returned to prevent electrolyte imbalance.

Question 33: A new biomedical technician is looking for a comprehensive, consensus-based standard on recommended practices for electrical safety testing and medical equipment management in a healthcare facility. Which organization would be the primary source for this type of guidance?

The Joint Commission (TJC).
The National Fire Protection Association (NFPA).
The Association for the Advancement of Medical Instrumentation (AAMI). (Correct answer)
The Occupational Safety and Health Administration (OSHA).

Correct answer: The Association for the Advancement of Medical Instrumentation (AAMI).

While NFPA (specifically NFPA 99) and TJC are critical for regulations and accreditation, AAMI is the primary organization that develops detailed, consensus-based standards (like ANSI/AAMI EQ56) and technical information reports (TIRs) specifically for the testing, maintenance, and management of medical instrumentation.

Question 34: What is the best practice for maintaining imaging systems performance over time?

Implement scheduled preventive maintenance (Correct answer)
Upgrade all equipment annually
Outsource all maintenance
Wait for failures before acting

Correct answer: Implement scheduled preventive maintenance

Scheduled preventive maintenance catches potential issues before they cause failures, maintaining reliability and extending equipment life.

Question 35: Which section of the small intestine is the primary site for nutrient absorption?

Cecum
Jejunum (Correct answer)
Ileum
Duodenum

Correct answer: Jejunum

The jejunum has extensive villi and microvilli (brush border) and is the primary site for absorption of carbohydrates, proteins, and most nutrients.

Question 36: Which biological indicator organism is the standard for testing the efficacy of steam sterilization?

Geobacillus stearothermophilus spores (Correct answer)
Clostridium difficile spores
Staphylococcus aureus cultures
Bacillus atrophaeus spores

Correct answer: Geobacillus stearothermophilus spores

Geobacillus stearothermophilus spores are highly resistant to moist heat and are the accepted standard biological indicator for steam sterilization monitoring.

Question 37: Which documentation is essential when working with imaging systems in CABT?

Detailed technical specifications and as-built diagrams (Correct answer)
Marketing materials
Only verbal notes
General descriptions without specifics

Correct answer: Detailed technical specifications and as-built diagrams

Detailed technical specifications and as-built diagrams provide the accurate reference information needed for maintenance and troubleshooting.

Question 38: When documenting assessment findings in CABT practice, which approach is MOST appropriate?

Summarize findings verbally without written documentation
Include only positive findings to maintain optimism
Record objective findings, measurements, and professional observations factually (Correct answer)
Use technical jargon that only experts can understand

Correct answer: Record objective findings, measurements, and professional observations factually

Assessment documentation must be objective, factual, and comprehensive. Recording measurements, observations, and findings without bias ensures that the documentation is useful for decision-making and withstands scrutiny.

Question 39: A pulse oximeter provides an SpO2 reading by measuring the differential absorption of two wavelengths of light. Which operational principle allows the device to distinguish between arterial and venous blood?

It uses a third wavelength of light to specifically isolate and cancel out the signal from venous blood.
The device only analyzes the pulsatile component of the light absorption, which corresponds to arterial blood flow. (Correct answer)
It measures the static (non-changing) absorption from all tissues and subtracts a baseline value.
The probe heats the tissue, which temporarily increases arterial flow for a more accurate measurement.

Correct answer: The device only analyzes the pulsatile component of the light absorption, which corresponds to arterial blood flow.

A pulse oximeter identifies arterial blood by detecting the pulsatile nature of its flow, which corresponds to the heartbeat. The device measures the light absorption during both the systolic (pulse) and diastolic (no pulse) phases. The changing, or AC component, of the signal is attributed to the pulsatile arterial blood, while the constant, or DC component, is from non-pulsatile venous blood and tissue. By focusing only on the AC component, it can accurately calculate arterial oxygen saturation (SpO2).

Question 40: In a biomedical pressure transducer using a strain gauge, what electrical parameter changes in response to physical deformation?

Capacitance
Inductance
Voltage
Resistance (Correct answer)

Correct answer: Resistance

Strain gauges work on the piezoresistive principle — mechanical deformation changes the geometry of the conductor, altering its electrical resistance.

Question 41: What is the value of continuing education in laboratory equipment for CABT professionals?

It is only needed for recertification
It keeps professionals current with evolving standards and practices (Correct answer)
It is primarily a social activity
It replaces workplace experience

Correct answer: It keeps professionals current with evolving standards and practices

Continuing education ensures professionals stay current with the latest developments, standards, and best practices in their field.

Question 42: A hospital bed's height adjustment motor is non-functional. The biomedical technician's first step in troubleshooting should be:

Disable the height function and return the bed to service
Check for power at the motor using a multimeter and verify control input signals (Correct answer)
Replace the motor immediately
Order all replacement parts preemptively

Correct answer: Check for power at the motor using a multimeter and verify control input signals

Before replacing components, the technician should verify power supply and control signals at the motor to isolate whether the fault is electrical supply, control circuit, or the motor itself.

Question 43: Which device helps patients with respiratory issues?

Infusion pump
Ventilator (Correct answer)
Defibrillator
ECG machine

Correct answer: Ventilator

A ventilator is a medical device that provides mechanical ventilation by moving breathable air into and out of the lungs. It is essential for patients who are unable to breathe adequately on their own due to various respiratory issues, such as severe pneumonia, acute respiratory distress syndrome, or during surgery. The ventilator supports lung function, ensuring proper oxygenation and carbon dioxide removal.

Question 44: Which organization accredits hospitals and evaluates biomedical equipment management programs in the United States?

IEEE
AAMI
The Joint Commission (TJC) (Correct answer)
FDA

Correct answer: The Joint Commission (TJC)

The Joint Commission accredits healthcare organizations and evaluates their environment of care standards, which include biomedical equipment management programs.

Question 45: Which action is required before performing internal maintenance on a high-voltage component such as a defibrillator capacitor?

Discharging the capacitor using the appropriate discharge resistor (Correct answer)
Removing the device battery
Unplugging the device from AC power only
Wearing latex gloves only

Correct answer: Discharging the capacitor using the appropriate discharge resistor

Defibrillator capacitors can hold lethal charges even after AC power is removed; they must be safely discharged through a proper discharge resistor before handling.

Question 46: What does the term 'intended use' mean in the context of FDA medical device regulation?

The clinical outcomes achieved in trials
The objective intent of the manufacturer as indicated in labeling and promotional materials (Correct answer)
How a device is physically designed to operate
The device's country of manufacture

Correct answer: The objective intent of the manufacturer as indicated in labeling and promotional materials

Intended use refers to the objective intent of the manufacturer as reflected in labeling, advertising, and promotional materials, which determines regulatory classification.

Question 47: Which risk management standard is specifically applicable to the design and manufacture of medical devices?

ANSI/ASSE Z690.3
IEC 31010
ISO 31000
ISO 14971 (Correct answer)

Correct answer: ISO 14971

ISO 14971 specifies a process for manufacturers to identify hazards associated with medical devices and manage associated risks throughout the product lifecycle.

Question 48: Which biomedical device delivers medications over time?

Thermometer
Stethoscope
Syringe
Infusion pump (Correct answer)

Correct answer: Infusion pump

An infusion pump is a medical device that delivers fluids, such as nutrients, medications, or blood, into a patient's body in controlled amounts. These pumps are designed to administer precise volumes at specific rates over an extended period, ensuring accurate and consistent delivery of therapeutic substances. This controlled delivery is vital for patient safety and treatment efficacy.

Question 49: What type of feedback is used in most biomedical amplifier designs to stabilize gain and improve linearity?

Regenerative feedback
Positive feedback
Negative feedback (Correct answer)
No feedback

Correct answer: Negative feedback

Negative feedback reduces gain but improves stability, linearity, bandwidth, and reduces distortion — essential characteristics for accurate biomedical signal amplification.

Question 50: A biomedical technician services a patient warming system. Which physiological mechanism does this device support by maintaining core body temperature?

Thermoregulation (Correct answer)
Hematopoiesis
Glucoregulation
Osmoregulation

Correct answer: Thermoregulation

Thermoregulation maintains core body temperature within narrow limits (36.5–37.5°C) to ensure optimal enzymatic function and cellular processes.

Question 51: When calibrating a patient scale used for medication dosing, the biomedical technician should use calibration weights that are:

Any available weights found in the department
Weights approximating the average patient weight only
NIST-traceable certified calibration weights (Correct answer)
Weights from a previous calibration kit, regardless of certification status

Correct answer: NIST-traceable certified calibration weights

Calibration must use NIST-traceable certified weights to ensure the calibration result is metrologically valid and legally defensible.

Question 52: In anatomical position, which directional term refers to a structure closer to the point of attachment of a limb?

Inferior
Distal
Proximal (Correct answer)
Lateral

Correct answer: Proximal

Proximal describes a position closer to the point of origin or attachment of a limb, while distal refers to farther away.

Question 53: In digital logic, what is the output of a NAND gate when both inputs are HIGH?

HIGH
LOW (Correct answer)
Depends on supply voltage
Undefined

Correct answer: LOW

A NAND gate outputs LOW only when all inputs are HIGH; it is the complement of an AND gate.

Question 54: Which approach to patient monitoring is considered best practice in current CABT standards?

The least expensive option
Traditional methods exclusively
One-size-fits-all protocols
Evidence-based, individualized interventions (Correct answer)

Correct answer: Evidence-based, individualized interventions

Evidence-based, individualized interventions combine the best available research with patient-specific factors for optimal outcomes.

Question 55: What does calibration involve?

Installing apps
Replacing parts
Measuring battery life
Ensuring measurement accuracy (Correct answer)

Correct answer: Ensuring measurement accuracy

Calibration is the process of comparing a device's measurements against a known standard to ensure its accuracy and reliability. In biomedical technology, this is crucial for diagnostic and treatment equipment to provide precise readings, which directly impacts patient safety and the effectiveness of medical interventions. Regular calibration helps maintain the integrity of medical devices over time.

Question 56: A central venous pressure (CVP) waveform shows an elevated 'a' wave. This finding is most associated with:

Pulmonary hypertension
Tricuspid regurgitation
Tricuspid stenosis or right ventricular non-compliance (Correct answer)
Mitral stenosis

Correct answer: Tricuspid stenosis or right ventricular non-compliance

An elevated 'a' wave in the CVP tracing reflects increased atrial contraction force against a non-compliant or obstructed right ventricle, as seen in tricuspid stenosis.

Question 57: What is the function of a low-pass filter in biomedical signal processing?

Attenuates all frequencies equally
Passes high frequencies and attenuates low frequencies
Passes low frequencies and attenuates high frequencies (Correct answer)
Passes a specific band of frequencies

Correct answer: Passes low frequencies and attenuates high frequencies

A low-pass filter allows signals below its cutoff frequency to pass while attenuating higher frequency components.

Question 58: What is the function of the kidneys?

Digest food
Pump blood
Filter blood (Correct answer)
Control breathing

Correct answer: Filter blood

The kidneys are vital organs that primarily function to filter waste products and excess water from the blood to produce urine. They also play crucial roles in regulating blood pressure, electrolyte balance, and red blood cell production. This filtration process is essential for maintaining the body's internal chemical balance.

Question 59: Which of the following accurately describes the function of the blood-brain barrier (BBB)?

It prevents all nutrients from entering the brain
It regulates the flow of cerebrospinal fluid between ventricles
It is formed by neurons in the cerebral cortex
It selectively restricts the passage of substances between blood and brain tissue (Correct answer)

Correct answer: It selectively restricts the passage of substances between blood and brain tissue

The BBB, formed by tight junctions between brain capillary endothelial cells and supported by astrocyte endfeet, selectively controls what enters brain tissue.

Question 60: Which type of maintenance is performed in response to an unexpected equipment failure?

Preventive maintenance
Predictive maintenance
Corrective maintenance (Correct answer)
Scheduled inspection

Correct answer: Corrective maintenance

Corrective maintenance is unplanned maintenance performed after equipment failure to restore it to operational condition.

Question 61: Which anatomical structure separates the thoracic cavity from the abdominal cavity and is the primary muscle of respiration?

Transversus abdominis
External oblique muscle
Diaphragm (Correct answer)
Internal intercostal muscles

Correct answer: Diaphragm

The diaphragm is a dome-shaped musculotendinous partition between the thorax and abdomen; its contraction increases thoracic volume to drive inspiration.

Question 62: Under the Safe Medical Devices Act (SMDA), which facilities are required to report device-related adverse events to the FDA?

Only outpatient clinics and ambulatory surgery centers
Manufacturers and importers only
Only device manufacturers
User facilities such as hospitals and nursing homes (Correct answer)

Correct answer: User facilities such as hospitals and nursing homes

The SMDA requires user facilities, including hospitals and nursing homes, to report device-related deaths and serious injuries to the FDA and/or manufacturer.

Question 63: A patient is connected to a dialysis machine. This machine is performing the primary function of which anatomical organ?

Spleen
Liver
Kidneys (Correct answer)
Pancreas

Correct answer: Kidneys

The kidneys are the primary organs of the excretory system, responsible for filtering waste products from the blood and producing urine. A dialysis machine is an artificial replacement for this essential function when the kidneys fail.

Question 64: What does the term 'duty cycle' refer to in electrosurgical units (ESU)?

The frequency of the cutting waveform
The maximum wattage output the unit can sustain
The number of surgeries performed between servicing
The ratio of on-time to total period of the RF waveform (Correct answer)

Correct answer: The ratio of on-time to total period of the RF waveform

Duty cycle is the ratio of active (on) time to total cycle time in the RF waveform, which determines whether the ESU operates in cut or coagulation mode.

Question 65: Which reflex arc component converts a stimulus into an electrical nerve impulse?

Effector
Receptor (Correct answer)
Interneuron
Motor neuron

Correct answer: Receptor

Receptors are specialized sensory structures that detect stimuli and transduce them into electrical signals (action potentials) that travel along afferent neurons.

Question 66: Which biomedical device parameter would be most affected by motion artifact during monitoring?

Static body temperature
Invasive arterial blood pressure mean
Pulse oximetry SpO2 reading (Correct answer)
Exhaled CO2 concentration

Correct answer: Pulse oximetry SpO2 reading

Pulse oximetry relies on detecting pulsatile light absorption changes and is highly susceptible to motion artifact that mimics or obscures the pulse signal.

Question 67: Which device supports cardiac function during surgery?

Pacemaker
Infusion pump
Heart-lung machine (Correct answer)
MRI machine

Correct answer: Heart-lung machine

A heart-lung machine, also known as a cardiopulmonary bypass machine, is a specialized biomedical device that temporarily takes over the function of the heart and lungs during open-heart surgery. It oxygenates the blood and circulates it throughout the body, allowing surgeons to operate on a still, bloodless heart. This critical support ensures the patient's vital organs receive adequate blood flow and oxygen during complex cardiac procedures.

Question 68: A transcutaneous electrical nerve stimulator (TENS) unit produces a burning sensation for the patient during use. After ruling out technique error, the technician should:

Replace the electrodes with larger ones immediately
Switch to a higher-frequency mode
Increase the pulse width to distribute current
Test output waveform and current amplitude against manufacturer specifications (Correct answer)

Correct answer: Test output waveform and current amplitude against manufacturer specifications

A burning sensation may indicate output parameters outside of specifications; testing the actual output waveform and amplitude against manufacturer specs is the proper diagnostic step.

Question 69: What role does collaboration play in laboratory equipment for CABT professionals?

It reduces individual accountability
It enhances outcomes through diverse perspectives and shared expertise (Correct answer)
It is only needed in emergencies
It slows down work unnecessarily

Correct answer: It enhances outcomes through diverse perspectives and shared expertise

Collaboration leverages diverse perspectives and combined expertise to achieve better outcomes than any individual could alone.

Question 70: What does the Diameter Index Safety System (DISS) do for low-pressure medical gas connections?

It sets the pressure of the gas
It displays the gas purity
It automatically switches to a backup gas supply
It uses gas-specific connector diameters so hoses cannot be attached to the wrong gas outlet (Correct answer)

Correct answer: It uses gas-specific connector diameters so hoses cannot be attached to the wrong gas outlet

DISS fittings use different bore diameters for each gas on non-interchangeable threaded connections. This prevents a hose for one gas from being connected to another gas's outlet or inlet.

Question 71: In medical electronics, what is the maximum allowable patient leakage current for a Type CF (cardiac floating) applied part under normal conditions per IEC 60601-1?

500 µA
1000 µA
100 µA
10 µA (Correct answer)

Correct answer: 10 µA

IEC 60601-1 limits patient leakage current for Type CF (cardiac floating) applied parts to 10 µA under normal conditions to protect against microshock hazards.

Question 72: During a survey, The Joint Commission (TJC) is evaluating a hospital's Medical Equipment Management Plan. Which of the following is a critical performance metric TJC will review to ensure equipment safety and reliability?

The number of new medical devices acquired in the last fiscal year.
The on-time completion percentage for scheduled equipment maintenance. (Correct answer)
The brand of test equipment used for preventive maintenance procedures.
The average cost of repairs for each device category.

Correct answer: The on-time completion percentage for scheduled equipment maintenance.

The Joint Commission emphasizes proactive risk management. A key indicator of a healthy Medical Equipment Management Plan is a high completion rate for scheduled preventive maintenance (PM). This demonstrates the hospital is actively maintaining its equipment to ensure it is safe and functions as intended, which directly impacts patient safety.

Question 73: A CBET notices a patient monitor displaying erratic readings after a nearby surgical cautery unit is activated. This interference is best categorized as:

Radiated susceptibility (immunity failure) (Correct answer)
Common-mode noise
Electrostatic discharge
Conducted emissions

Correct answer: Radiated susceptibility (immunity failure)

When a device malfunctions due to electromagnetic energy radiated from a nearby source, this is a radiated susceptibility or immunity failure.

Question 74: Which approach is recommended for troubleshooting imaging systems issues?

Rely solely on past experience
Use systematic isolation and testing methods (Correct answer)
Wait for the problem to resolve itself
Replace all components simultaneously

Correct answer: Use systematic isolation and testing methods

Systematic isolation and testing methodically narrows down the root cause, making troubleshooting efficient and accurate.

Question 75: Which maintenance schedule item is considered a 'time-based' preventive maintenance task?

Cleaning a device only when visibly soiled
Replacing a filter only when flow is reduced
Replacing an infusion pump battery every 2 years regardless of cycles (Correct answer)
Calibrating a device after each repair

Correct answer: Replacing an infusion pump battery every 2 years regardless of cycles

Time-based preventive maintenance replaces components on a fixed calendar interval regardless of use or condition, such as replacing a battery every two years.

Question 76: Which standard defines how medical images and related information are stored and transmitted between imaging devices and PACS?

HL7
IEEE 802.11
DICOM (Correct answer)
NFPA 99

Correct answer: DICOM

DICOM (Digital Imaging and Communications in Medicine) is the standard for handling, storing, and transmitting medical imaging data between modalities, PACS, and workstations.

Question 77: What is the medical term for high blood pressure?

Hypertension (Correct answer)
Hypoglycemia
Hyperglycemia
Hypotension

Correct answer: Hypertension

Hypertension is the medical term for high blood pressure, a condition where the force of blood against the artery walls is consistently too high. It is a significant risk factor for heart disease, stroke, and kidney disease. Regular monitoring and management are crucial for individuals diagnosed with hypertension.

Question 78: Which of the following best describes 'risk priority number' (RPN) used in Failure Mode and Effects Analysis (FMEA)?

The number of reported adverse events divided by total devices in service
The product of severity, occurrence, and detectability ratings for a failure mode (Correct answer)
The total cost of potential failures over device lifetime
A regulatory classification assigned by the FDA

Correct answer: The product of severity, occurrence, and detectability ratings for a failure mode

RPN is calculated by multiplying severity × occurrence × detectability scores, helping prioritize which failure modes require the most urgent corrective action.

Question 79: What is the primary advantage of using a switching power supply over a linear power supply in biomedical equipment?

Lower electromagnetic interference
Better regulation at all loads
Higher efficiency and smaller size (Correct answer)
Lower output ripple

Correct answer: Higher efficiency and smaller size

Switching power supplies operate at high frequencies allowing smaller transformers and capacitors, resulting in higher efficiency (often >85%) and reduced size/weight.

Question 80: In an ECG machine, the CMRR (Common Mode Rejection Ratio) specification is important because it:

Rejects 60 Hz power line interference (Correct answer)
Increases signal amplitude
Amplifies differential signals only
Filters high-frequency noise

Correct answer: Rejects 60 Hz power line interference

High CMRR allows the differential amplifier to reject common-mode noise such as 60 Hz interference from power lines while amplifying the ECG signal.

Question 81: During cardiopulmonary resuscitation (CPR), compressions are performed on the sternum. Which anatomical landmark guides correct hand placement?

Sternal angle (angle of Louis)
Lower half of the sternum (Correct answer)
Manubrium
Xiphoid process

Correct answer: Lower half of the sternum

CPR guidelines direct compressions to the lower half of the sternum to compress the heart between the sternum and vertebral column.

Question 82: In a medical device's power supply circuit, an inductor is often used in conjunction with a capacitor. What is the primary function of the inductor in this filtering application?

To step up the voltage.
To store electrical charge.
To block direct current (DC).
To oppose changes in current. (Correct answer)

Correct answer: To oppose changes in current.

An inductor is a passive electronic component that stores energy in a magnetic field when electric current flows through it. Its fundamental property is to oppose any change in the electric current flowing through it. In power supply filters, this characteristic helps to smooth out the pulsating DC output after rectification, reducing ripple and providing a more stable DC voltage.

Question 83: A technician is troubleshooting a patient monitoring system where a very weak physiological signal (like an ECG) is not being displayed correctly. The issue is likely in the amplification stage. Which component is specifically designed to amplify such weak signals with high precision in medical instruments?

A relay
A fuse
An operational amplifier (Op-Amp) (Correct answer)
A transformer

Correct answer: An operational amplifier (Op-Amp)

Operational amplifiers (Op-Amps) are essential components in medical instrumentation for amplifying weak biological signals, such as those from an ECG or EEG. They provide the high gain, high input impedance, and low output impedance necessary to accurately boost these signals for processing and display without significant distortion or loss.

Question 84: What is the most important professional competency for CABT certification in laboratory equipment?

Speed of task completion
Deep knowledge combined with practical application skills (Correct answer)
Ability to work alone exclusively
Memorization of all reference materials

Correct answer: Deep knowledge combined with practical application skills

Professional competency requires both deep knowledge of the subject matter and the ability to apply that knowledge in practical situations.

Question 85: A biomedical technician is replacing a wall outlet in a patient's room designated as a "wet procedure location." Which type of receptacle is required to be installed to enhance safety?

A surge-protecting receptacle.
A hospital-grade receptacle. (Correct answer)
An industrial-grade, twist-lock receptacle.
A standard residential-grade duplex receptacle.

Correct answer: A hospital-grade receptacle.

Hospital-grade receptacles are mandatory in patient care areas, especially wet locations. They are built to higher standards of durability and, most importantly, provide superior and more reliable grounding contact retention to withstand frequent use and abuse, which is critical for patient safety. They are identifiable by a green dot on the face of the receptacle.

Question 86: In CABT practice, what is the best approach to quality improvement in laboratory equipment?

Make changes without measuring results
Copy what other organizations do without analysis
Use data-driven methods with measurable outcomes (Correct answer)
Wait for problems to occur before acting

Correct answer: Use data-driven methods with measurable outcomes

Data-driven quality improvement with measurable outcomes ensures that changes actually produce the intended improvements and can be verified.

Question 87: Which type of tissue connects muscles to bones?

Fat
Ligaments
Tendons (Correct answer)
Cartilage

Correct answer: Tendons

Tendons are strong, fibrous connective tissues that attach muscles to bones. They are crucial for transmitting the force generated by muscle contractions to the bones, enabling movement. Ligaments, in contrast, connect bones to other bones, providing joint stability.

Question 88: In an EEG amplifier, why is a notch filter at 60 Hz commonly used?

To prevent electrode polarization
To increase signal-to-noise ratio across all frequencies
To eliminate power line interference from the signal (Correct answer)
To amplify brain wave frequencies

Correct answer: To eliminate power line interference from the signal

A 60 Hz notch filter selectively attenuates power line frequency interference while passing the EEG signal frequencies (0.5–100 Hz).

Question 89: Pulse transit time (PTT)-based blood pressure monitoring estimates blood pressure by measuring:

Thermal dilution between two temperature sensors
The time delay between the ECG R-wave and the arrival of the pulse wave at a peripheral site (Correct answer)
Oxygen saturation at two different wavelengths
Stroke volume via aortic impedance

Correct answer: The time delay between the ECG R-wave and the arrival of the pulse wave at a peripheral site

PTT-based monitoring measures the time for a pressure wave to travel from the heart to a peripheral sensor; shorter PTT correlates with higher blood pressure.

Question 90: In Certified Associate in Biomedical Technology practice, what is the CORRECT sequence when performing a technical procedure?

Document, execute, then plan
Execute, then plan and review
Plan, prepare, execute, verify, and document (Correct answer)
Execute immediately and document only if issues arise

Correct answer: Plan, prepare, execute, verify, and document

The correct sequence follows a systematic approach: plan the procedure, prepare necessary resources, execute according to standards, verify results meet specifications, and document the process and outcomes. This ensures quality and accountability.

Question 91: Which federal law established the framework for regulating health information technology and incentivizing adoption of electronic health records (EHRs)?

Affordable Care Act (2010)
HIPAA (1996)
FDA Safety and Innovation Act (2012)
HITECH Act (2009) (Correct answer)

Correct answer: HITECH Act (2009)

The HITECH Act of 2009 established programs to incentivize meaningful use of EHRs and strengthened HIPAA privacy and security enforcement.

Question 92: When performing incoming inspection on a newly received infusion pump, a biomedical technician should FIRST:

Update the CMMS with calibration due dates
Verify the device against the purchase order and check for shipping damage (Correct answer)
Perform a full safety test per IEC 60601-1
Place the device immediately into service

Correct answer: Verify the device against the purchase order and check for shipping damage

Incoming inspection begins with verifying the received item matches the purchase order and inspecting for any physical damage from shipping.

Question 93: During a defibrillator self-test, the energy readback shows 195 J when 200 J was selected. What is the acceptable tolerance per most standards?

±5%
±25%
±15% (Correct answer)
±1%

Correct answer: ±15%

Most defibrillator standards, including AAMI DF80, allow a ±15% tolerance on delivered energy compared to the selected energy setting.

Question 94: Which NFPA 99 category designation applies to spaces where failure of equipment is likely to cause major injury or death to patients or caregivers?

Category 4
Category 3
Category 1 (Correct answer)
Category 2

Correct answer: Category 1

NFPA 99 Category 1 (formerly 'critical care') covers areas where equipment failure could result in major injury or death.

Question 95: Which of the following best describes the role of surfactant in the lungs?

Reduces surface tension to prevent alveolar collapse (Correct answer)
Filters particulates from inhaled air
Carries oxygen from alveoli to blood
Facilitates gas exchange across the alveolar membrane

Correct answer: Reduces surface tension to prevent alveolar collapse

Surfactant, produced by type II pneumocytes, reduces surface tension in alveoli, preventing collapse during exhalation.

Question 96: What is an electrosurgical unit used for?

Create sutures
X-ray imaging
Perform surgery (Correct answer)
Deliver oxygen

Correct answer: Perform surgery

An electrosurgical unit (ESU) is a medical device used in surgery to cut, coagulate, desiccate, or fulgurate tissue using high-frequency electrical current. It allows surgeons to make precise incisions with minimal bleeding and to control bleeding during procedures. The ESU is a versatile tool that enhances surgical efficiency and patient safety by providing controlled tissue effects.

Question 97: Which standard specifically governs the safety requirements for medical electrical equipment at the international level?

IEEE 802.11
IEC 60601-1 (Correct answer)
OSHA 1910.303
NFPA 70

Correct answer: IEC 60601-1

IEC 60601-1 is the international standard defining safety and essential performance requirements for medical electrical equipment.

Question 98: In a patient care environment, 'equipotential grounding' primarily protects against:

Voltage surges from lightning
Radio-frequency interference
Microshock from potential differences between grounded surfaces (Correct answer)
Electrostatic discharge from staff clothing

Correct answer: Microshock from potential differences between grounded surfaces

Equipotential grounding ensures all conductive surfaces in a patient care area are at the same potential, preventing microshock from small current flow through the patient.

Question 99: During a surgical procedure requiring laparotomy, the surgeon identifies the retroperitoneal organs. Which of the following is a retroperitoneal organ?

Spleen
Kidneys (Correct answer)
Transverse colon
Stomach

Correct answer: Kidneys

The kidneys are retroperitoneal, lying behind the peritoneum against the posterior abdominal wall, unlike most abdominal organs covered by peritoneum.

Question 100: In CABT practice, when should a patient's condition be reassessed?

At regular intervals and when status changes (Correct answer)
Only at admission and discharge
Only when the patient requests it
Once per week

Correct answer: At regular intervals and when status changes

Regular reassessment and reassessment upon status changes ensure that care plans remain appropriate and responsive to the patient's needs.

Question 101: Which blood vessel directly supplies oxygenated blood to the myocardium?

Superior vena cava
Coronary arteries (Correct answer)
Pulmonary artery
Aortic arch branches

Correct answer: Coronary arteries

The left and right coronary arteries arise from the aortic root and supply oxygenated blood directly to the myocardium.

Question 102: What type of biomedical device is used for internal imaging?

Ultrasound
Defibrillator (Correct answer)
Ventilator
ECG

Correct answer: Defibrillator

A defibrillator's primary function is to deliver an electric shock to the heart. While not an imaging device in the traditional sense like ultrasound or MRI, some advanced defibrillators incorporate diagnostic capabilities that allow for internal monitoring of the heart's electrical activity. This monitoring provides a 'picture' of the heart's internal electrical state, which is crucial for determining the need for and effectiveness of defibrillation, thus indirectly relating to understanding internal conditions.

Question 103: In a patient with a fractured femur, which artery is at greatest risk of injury due to its proximity to the bone in the femoral shaft?

Perforating branches of the deep femoral artery (Correct answer)
Femoral artery
Tibial artery
Popliteal artery

Correct answer: Perforating branches of the deep femoral artery

Perforating branches of the profunda femoris (deep femoral artery) run close to the femoral shaft and are commonly injured in mid-shaft femur fractures.

Question 104: Which factor MOST significantly affects the quality of technical outcomes in CABT practice?

The speed at which procedures are completed
The practitioner's training, preparation, and attention to detail (Correct answer)
The time of day the procedure is performed
The brand of equipment being used

Correct answer: The practitioner's training, preparation, and attention to detail

The quality of technical outcomes depends primarily on the practitioner's level of training, thorough preparation, and careful attention to detail. While equipment matters, the professional's competence is the most significant factor.

Question 105: What is the function of a defibrillator?

Take blood pressure
Deliver electric shock to the heart (Correct answer)
Monitor oxygen levels
Administer medications

Correct answer: Deliver electric shock to the heart

A defibrillator is a critical medical device specifically designed to deliver a controlled electric shock to the heart. This shock is used to restore a normal heart rhythm in individuals experiencing life-threatening arrhythmias, such as ventricular fibrillation or pulseless ventricular tachycardia. Its primary function is to reset the heart's electrical activity, potentially saving a patient's life.

Question 106: Which of the following electronic components is a semiconductor device that allows current to flow in only one direction and is often used for rectification in power supplies for medical equipment?

Capacitor
Diode (Correct answer)
Inductor
Resistor

Correct answer: Diode

A diode is a semiconductor device with two terminals that essentially acts as a one-way switch for current. It allows current to flow easily in one direction (forward bias) but severely restricts current from flowing in the opposite direction (reverse bias). This property is fundamental for converting alternating current (AC) to direct current (DC), a process called rectification, which is crucial for powering most electronic medical devices.

Question 107: What is the Nyquist theorem's requirement for sampling an analog signal to avoid aliasing?

Sample at least 10 times the signal frequency
Sample at least twice the highest frequency in the signal (Correct answer)
Sample at the same rate as the signal frequency
Sample at the signal's fundamental frequency

Correct answer: Sample at least twice the highest frequency in the signal

The Nyquist theorem states that the sampling rate must be at least twice the highest frequency component of the signal to accurately reconstruct it without aliasing.

Question 108: Why must oil, grease, and petroleum-based lubricants never be used on oxygen regulators or fittings?

They contaminate the oxygen with odor
They can ignite violently in an oxygen-enriched environment (Correct answer)
They corrode brass fittings
They reduce the gas flow rate

Correct answer: They can ignite violently in an oxygen-enriched environment

Oxygen supports combustion. Hydrocarbons such as oil and grease can ignite spontaneously or explosively when exposed to high-pressure oxygen, so only oxygen-compatible lubricants are used.

Question 109: A surgical electrosurgical unit (ESU) causes burns at the dispersive electrode site. Which is the most likely cause?

Inadequate contact area or poor adhesion of the dispersive electrode (Correct answer)
Incorrect frequency setting
Broken active electrode pencil
Excessive generator output setting

Correct answer: Inadequate contact area or poor adhesion of the dispersive electrode

Burns at the dispersive (return) electrode site are most commonly caused by inadequate skin contact area or poor adhesion, increasing current density at that site.

Question 110: What does an ECG machine measure?

Lung function
Heart electrical activity (Correct answer)
Blood sugar
Body temperature

Correct answer: Heart electrical activity

An Electrocardiogram (ECG or EKG) machine measures and records the electrical activity of the heart. It detects the tiny electrical changes on the skin that arise from the heart muscle's electrophysiological pattern during each heartbeat. This information is crucial for diagnosing various heart conditions, including arrhythmias, heart attacks, and other cardiac abnormalities.

Question 111: A technician is preparing an autoclave for a standard sterilization cycle for wrapped surgical instruments. Which combination of temperature, pressure, and time is a widely recognized minimum for effective steam sterilization in a gravity displacement sterilizer?

100°C (212°F) at 0 psi for 60 minutes
121°C (250°F) at 15 psi for 30 minutes (Correct answer)
110°C (230°F) at 10 psi for 45 minutes
134°C (273°F) at 30 psi for 4 minutes

Correct answer: 121°C (250°F) at 15 psi for 30 minutes

The standard and widely accepted parameters for steam sterilization of wrapped goods in a gravity displacement autoclave are 121°C (250°F) at a pressure of at least 15 psi for a minimum of 30 minutes. These specific conditions of steam, temperature, pressure, and time are required to effectively kill all microorganisms, including spores. The other options represent incorrect combinations of these critical parameters.

Question 112: A ventilator's flow sensor reads consistently 15% higher than the reference standard during calibration. This is an example of:

Hysteresis
Random error
Systematic bias (offset error) (Correct answer)
Noise artifact

Correct answer: Systematic bias (offset error)

A consistent, predictable deviation in one direction from the true value is called systematic bias or offset error, which can often be corrected through calibration adjustment.

Question 113: Which test instrument is used to measure the insulation resistance of medical electrical equipment to detect degraded insulation?

Oscilloscope
Clamp meter
Megohmmeter (megger) (Correct answer)
Digital multimeter set to AC volts

Correct answer: Megohmmeter (megger)

A megohmmeter applies a high DC test voltage (typically 500 V) and measures the resulting resistance to assess insulation integrity.

Question 114: For cardiac catheterization laboratory equipment, NFPA 99 specifies a maximum patient lead leakage current of:

10 µA (Correct answer)
500 µA
50 µA
100 µA

Correct answer: 10 µA

In critical care (Category 1) areas with intracardiac leads, the patient lead leakage limit is 10 µA to prevent microshock-induced fibrillation.

Question 115: What is the time constant (τ) of an RC circuit with R = 10 kΩ and C = 100 µF?

1 second (Correct answer)
100 seconds
0.1 seconds
10 seconds

Correct answer: 1 second

τ = RC = 10,000 Ω × 0.0001 F = 1 second.

Question 116: A bispectral index (BIS) monitor primarily measures which physiological parameter?

Degree of neuromuscular blockade
Cardiac output via echocardiography
Depth of anesthesia or sedation via processed EEG (Correct answer)
Cerebral perfusion pressure

Correct answer: Depth of anesthesia or sedation via processed EEG

The BIS monitor uses a processed EEG algorithm to generate a numeric index (0–100) that reflects the patient's level of consciousness or depth of anesthesia.

Question 117: A biomedical technician is servicing a diagnostic imaging system and finds a spreadsheet on the desktop containing a list of patient names and their medical record numbers. According to the Health Insurance Portability and Accountability Act (HIPAA), what is the most appropriate immediate action?

Ignore the file, as the technician is not a clinical user of the system.
Delete the file immediately to prevent unauthorized access by others.
Report the finding to their immediate supervisor and the facility's designated Privacy Officer. (Correct answer)
Make a copy of the file onto an encrypted drive as evidence of the breach.

Correct answer: Report the finding to their immediate supervisor and the facility's designated Privacy Officer.

The discovery of unsecured Protected Health Information (PHI) is a potential data breach under HIPAA. The technician's duty is not to independently decide how to handle the data (e.g., deleting or copying it) but to follow organizational policy by reporting the incident through the proper channels, which always includes their supervisor and the HIPAA Privacy/Security Officer.

Question 118: In CABT certification, what does redundancy in system design primarily provide?

Simplified maintenance
Increased complexity
Lower initial cost
Fault tolerance and high availability (Correct answer)

Correct answer: Fault tolerance and high availability

Redundancy provides fault tolerance by ensuring that if one component fails, backup components maintain system availability.

Question 119: An oscilloscope reading shows a sinusoidal wave with peak voltage of 10V. What is its RMS voltage?

5 V
7.07 V (Correct answer)
10 V
14.14 V

Correct answer: 7.07 V

RMS voltage = Vpeak / √2 = 10V / 1.414 ≈ 7.07 V for a pure sinusoidal waveform.

Question 120: Which type of epithelium lines the urinary bladder and is capable of stretching?

Simple squamous epithelium
Stratified squamous epithelium
Pseudostratified columnar epithelium
Transitional epithelium (urothelium) (Correct answer)

Correct answer: Transitional epithelium (urothelium)

Transitional epithelium (urothelium) lines the urinary bladder and ureters, uniquely able to stretch as the bladder fills.

CABT Certified Associate in Biomedical Technology Exam

The CABT Certified Associate in Biomedical Technology Exam validates foundational competencies in biomedical equipment technology, including installation, maintenance, troubleshooting, anatomy, electronics, patient safety, and healthcare regulations.

120

Questions

120 min

Time Limit

70%

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